want to display B<bits> per second. This is what the B<L<data
calculation|rrdgraph_data/CDEF>> command is designed for. After
B<consolidating> the data, a copy is made and this copy is modified
-using a rather powerful B<L<RPN|rrdgraph_rpn/>> command set.
+using a rather powerful B<L<RPN|rrdgraph_rpn>> command set.
When you are done fetching and processing the data, it is time to
graph it (or print it). This ends the B<rrdtool graph> sequence.
B<RRA> the data should come from. Defaults are: 1 day ago until
now, with the best possible resolution. B<Start> and B<end> can
be specified in several formats, see
-L<AT-STYLE TIME SPECIFICATION|rrdfetch/> and L<rrdgraph_examples>.
+L<AT-STYLE TIME SPECIFICATION|rrdfetch> and L<rrdgraph_examples>.
By default, B<rrdtool graph> calculates the width of one pixel in
the time domain and tries to get data from an B<RRA> with that
resolution. With the B<step> option you can alter this behaviour.
A horizontal string at the top of the graph and/or a vertically
placed string at the left hand side of the graph.
+=item Right Axis
+
+[B<--right-axis> I<scale>B<:>I<shift>]
+[B<--right-axis-label> I<label>]
+
+A second axis will be drawn to the right of the graph. It is tied to the
+left axis via the scale and shift parameters. You can also define a label
+for the right axis.
+
+[B<--right-axis-format> I<format-string>]
+
+By default the format of the axis lables gets determined automatically. If
+you want todo this your self, use this option with the same %lf arguments
+you know from the PRING and GPRINT commands.
+
=head2 Size
[B<-w>|B<--width> I<pixels>]
How many digits should rrdtool assume the y-axis labels to be? You
may have to use this option to make enough space once you start
-fideling with the y-axis labeling.
+fiddling with the y-axis labeling.
[B<--units=si>]
[B<-z>|B<--lazy>]
-Only generate the graph if the current graph is out of date or not
-existent.
+Only generate the graph if the current graph is out of date or not existent.
+Note, that only the image size will be returned, if you run with lazy even
+when using graphv and even when using PRINT.
+
+
+[B<--daemon> I<address>]
+
+Address of the L<rrdcached> daemon. If specified, a C<flush> command is sent
+to the server before reading the RRD files. This allows the graph to contain
+fresh data even if the daemon is configured to cache values for a long time.
+For a list of accepted formats, see the B<-l> option in the L<rrdcached> manual.
+
+ rrdtool graph [...] --daemon unix:/var/run/rrdcached.sock [...]
[B<-f>|B<--imginfo> I<printfstr>]
the actual graph, C<SHADEA> for the left and top border, C<SHADEB> for the
right and bottom border, C<GRID>, C<MGRID> for the major grid, C<FONT> for
the color of the font, C<AXIS> for the axis of the graph, C<FRAME> for the
-line around the color spots and finally C<ARROW> for the arrow head pointing
+line around the color spots
, and finally C<ARROW> for the arrow head pointing
up and forward. Each color is composed out of three hexadecimal numbers
specifying its rgb color component (00 is off, FF is maximum) of red, green
and blue. Optionally you may add another hexadecimal number specifying the
[B<-n>|B<--font> I<FONTTAG>B<:>I<size>B<:>[I<font>]]
-This lets you customize which font to use for the various text
-elements on the RRD graphs. C<DEFAULT> sets the default value for all
-elements, C<TITLE> for the title, C<AXIS> for the axis labels, C<UNIT>
-for the vertical unit label, C<LEGEND> for the graph legend.
+This lets you customize which font to use for the various text elements on
+the RRD graphs. C<DEFAULT> sets the default value for all elements, C<TITLE>
+for the title, C<AXIS> for the axis labels, C<UNIT> for the vertical unit
+label, C<LEGEND> for the graph legend, C<WATERMARK> for the watermark on the
+edge of the graph.
Use Times for the title: C<--font TITLE:13:Times>
All text in rrdtool is rendered using Pango. With the B<--pango-markup> option, all
text will be processed by pango markup. This allows to embed some simple html
like markup tags using
-
+
<span key="value">text</span>
Apart from the verbose syntax, there are also the following short tags available.
small Makes font relatively smaller, equivalent to <span size="smaller">
tt Monospace font
u Underline
-
+
More details on L<http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html>.
[B<-G>|B<--graph-render-mode> {B<normal>,B<mono>}]
other statements are useful but optional.
See L<rrdgraph_data> and L<rrdgraph_rpn> for the exact format.
-=head2 Graph and print elements
+NOTE: B<Graph and print elements>
You need at least one graph element to generate an image and/or
at least one print statement to generate a report.
See L<rrdgraph_graph> for the exact format.
-
-=back
-
=head2 graphv
Calling rrdtool with the graphv option will return information in the
Especially the 'graph_*' keys are new. They help applications that want to
know what is where on the graph.
+=head1 ENVIRONMENT VARIABLES
+
+The following environment variables may be used to change the behavior of
+C<rrdtoolE<nbsp>graph>:
+
+=over 4
+
+=item B<RRDCACHED_ADDRESS>
+
+If this environment variable is set it will have the same effect as specifying
+the C<--daemon> option on the command line. If both are present, the command
+line argument takes precedence.
+
+=back
+
=head1 SEE ALSO
L<rrdgraph> gives an overview of how B<rrdtool graph> works.
projects / rrdtool.git / blobdiff